ARDEX X 7 R™ is a multi-purpose, rapid setting, polymer modified, thin set mortar for setting porcelain, quarry, ceramic, mosaic and most natural stone tiles in exterior or interior floor and wall applications. ARDEX X 7 R is fast setting, allows for grouting in just 3 hours and is especially formulated with enhanced properties of adhesion and flexibility. ARDEX X 7 R can be used in wet areas, including residential and commercial showers and swimming pools, as well as over in-floor heating systems.